It's way too complex to recommend just any course.
But check out the Photoshop Virtual Summit events, you're right on time.
Photography
A place to politely discuss the tools, technique and culture of photography.
This is not a good place to simply share cool photos/videos or promote your own work and projects, but rather a place to discuss photography as an art and post things that would be of interest to other photographers.
Piximperfect on Youtube. He breaks down almost every video into step-by-step so you can follow along.
Youtube what you're trying to do, and build up from that.
This is it. I've been using it for literally 15 years and have no formal or structured training, just figuring things out and looking up specifics. I'm sure I'm doing plenty of things "the wrong way" but my clients don't care.
Is there an echo in here?
The best will depend on what you’re looking to do
Jump around tutorials for specific effects and those will in turn teach you the capabilities of the numerous tools available
How do I apply for mod here? If not, can the current mods create a bot or something to thrash these kind of posts and point OP (and future OP's) to the hundreds of available topics/answers on this sub already? Same questions, every, single, day. Urgh.
Just wondering, how can I learn more about Photoshop?
If I was starting from scratch right now with photoshop, I think an in person community college or equivalent class would be best since you can ask lots of questions. I'd supplement that with youtube vids & just messing around with the program.
You don’t need a course. Calculate what you want to do, then search YouTube for that solution. There is a tutorial for absolutely everything.
Photoshop isn’t a software that requires you to do things in a particular way. There are a 100 ways to do the same thing.